NASA releases details of Titan submarine concept By David Szondy 2/10/15 The Titan submarine would explore Kraken Mare [Space Future: http://futuristicnews.com/category/future-space/ &amp; http://futuristicshop.com/category/space-future-books/ Mars in the Future: http://futuristicnews.com/tag/mars/ NASA: http://futuristicnews.com/tag/nasa/]